Topics

1

Graphics / unefficient drawing

« on: February 05, 2022, 05:46:52 am »

Hello,
I am working on a random project where i need to have a code as efficient as possible so i tried to check if the way I draw is efficient enough but it isn't.
I saw people how draw millions of points whie still having a decent amount of FPS but I can't draw more than around 200000 points.
I tried with circles, recangles, convexs, rectangles with the size of a pixel but it never gets better.
If you have a solution I would be happy to here it.
Here is the code :

    while(window.isOpen()){
        window.clear();
        while(window.pollEvent(event)){
            if((event.type == Event::KeyPressed) && (event.key.code == Keyboard::Enter) && (!fullscreen)) {
                                fullscreen = true;
                                window.create(VideoMode(1920, 1080), nameProject, (fullscreen ? Style::Fullscreen : Style::Resize|Style::Close));
                        }
            else if((event.type == Event::KeyPressed) && (event.key.code == Keyboard::Escape) && (fullscreen)) {
                                fullscreen = false;
                                window.create(VideoMode(1920, 1080), nameProject, (fullscreen ? Style::Fullscreen : Style::Resize|Style::Close));
                        }
            if((event.type == Event::KeyPressed) && (event.key.code == Keyboard::Space) && (fullscreen)) {
                pause = !pause;
                        }
            if(event.type == Event::Closed){
                window.close();
            }
        }

        float dt = gameClock.getElapsedTime().asSeconds();
        gameClock.restart();

        for(int i=0; i<player.size(); i++){
            if(fullscreen && !pause){
                player[i].x+=player[i].vx*dt;
                player[i].y+=player[i].vy*dt;

                if(player[i].x < player[i].r){
                    player[i].x += 2*(player[i].r-player[i].x);
                    player[i].vx *= -1;
                }
                else if(player[i].x > window.getSize().x-player[i].r){
                    player[i].x += 2*(window.getSize().x-player[i].r-player[i].x);
                    player[i].vx *= -1;
                }
                if(player[i].y < player[i].r){
                    player[i].y += 2*(player[i].r-player[i].y);
                    player[i].vy *= -1;
                }
                else if(player[i].y > window.getSize().y-player[i].r){
                    player[i].y += 2*(window.getSize().y-player[i].r-player[i].y);
                    player[i].vy *= -1;
                }
            }
            if(fullscreen){
                player[i].body.setPosition(player[i].x-player[i].r, player[i].y-player[i].r);
                window.draw(player[i].body);
            }
        }

        window.display();
        Sleep(1);
    }

2

Graphics / SFML how to draw a line

« on: January 24, 2022, 07:49:27 pm »

Hello, I had a problem to draw a line so I made a function with convex and I thought maybe you coul add this feature, here is the code :

// a = x1 ; b = y1 ; c = x2 ; d = y2 ; e = thickness
void line(float a, float b, float c, float d, float e){
    ConvexShape convex;
    convex.setPointCount(4);
    if(c-a == 0){
        convex.setPoint(0, Vector2f(a-e/2, b));
        convex.setPoint(1, Vector2f(a+e/2, b));
        convex.setPoint(2, Vector2f(c+e/2, d));
        convex.setPoint(3, Vector2f(c-e/2, d));
    }
    else{
        float alpha = atan((d-b)/(c-a));
        convex.setPoint(0, Vector2f(a-(e/2)*sin(alpha), b+(e/2)*cos(alpha)));
        convex.setPoint(1, Vector2f(a+(e/2)*sin(alpha), b-(e/2)*cos(alpha)));
        convex.setPoint(2, Vector2f(c+(e/2)*sin(alpha), d-(e/2)*cos(alpha)));
        convex.setPoint(3, Vector2f(c-(e/2)*sin(alpha), d+(e/2)*cos(alpha)));
    }
   
    window.draw(convex);
}